Smart Lithium-ion Battery Module 135 mAh T3.9 x W19.0 x L28.0 mm (After 500 cycles) Specification Value Unit Norminal Voltage 3.7 V Shipping Voltage 3.70 ∼ 3.95 V Norminal Capacity 135 mAh 0.2C Discharging Minimum Capacity 130 mAh 0.2C Discharging Maximum Charging Voltage 4.2 V Standard Charging Current 0.5 C =65mA Maximum Charging Current 1 C =130mA Discharging Cut Off Voltage 3 V Maximum Discharging Current 1 C Internal Resistance 350 mOhm Cycle Life 500 Cycles 0 to 45 ̊C -20 to 60 ̊C Conditions 0.2C =130mA over 80% at 0.5C Discharging Operation Temperature Range Standard Charging Standard Discharging Dimensions（Actual size） L:28.0mm W:19.0mm REAR SEL371826 is a Li-ion battery which is achieved a balance between thinness and small shape by 135mAh capacity. It is suitable for the main power supply of smart and digital watch devices due to square shape. There is a protection circuit embedded in a small shape of the package. You can choose the NTC circuit and the connector available as option. TOP SIDE T:3.9mm Specification Charge: CC/CV 4.2V, 0.05C-cut off, 25˚C Discharge: CC 0.2C, 3.0V cut off, 25˚C Charge Characteristics 4.4 4.4 0.2C 0.5C 1.0C 4.2 4.0 Voltage /V 3.6 3.4 3.2 3.2 0 50.0 Temperature Characteristics Capacity /mAh 100.0 3.0 150.0 Charge: CC/CV 4.2V, 0.5C, 0.05C-cut off, 25˚C Discharge: CC:0.2C 3.0V-cut off 4.4 25˚C -20˚C -10˚C 0˚C 60˚C 4.2 4.0 Voltage /V 3.8 3.4 3.8 3.6 150.0 150.0 Charge: CC/CV 4.2V, 0.5C, 0.05C-cut off, 25˚C Discharge: CC:0.2C 3.0V-cut off, 25˚C 1cyc 10cyc 100cyc 300cyc 500cyc 4.0 3.6 3.4 100.0 100.0 3.8 3.2 Capacity /mAh Capacity /mAh 4.4 3.2 50.0 50.0 4.2 3.4 0 0 Cycle Characteristics Voltage /V Voltage /V 3.6 3.0 0.2C 0.5C 1.0C 4.2 4.0 3.8 3.0 Charge: CC/CV 4.2V, 0.5C, 0.05C-cut off, 25˚C Discharge: 3.0V-cut off, 25˚C Discharge Characteristics 3.0 0 50.0 Capacity /mAh 100.0 150.0 Specifications are subject to change without notice. Seiko Instruments Inc. Homepage http://www.sii.co.jp/small_lib/en Smart Enerty Busines Division 8, Nakase 1-chome, Mihama-ku, Chiba-shi, Chiba 261-8507, Japan Telephone:+81-43-211-1217 Facsimile:+81-43-211-8395 Seiko Instruments U.S.A.,Inc. Seiko Instruments GmbH Seiko Instruments Taiwan Inc. Seiko Instruments (Shanghai) Inc. Telephone:+1-310-517-7771 Telephone:+886-2-2563-5001 Telephone:+49-6102-2970 Telephone:+86-21-6375-6611 2-1502